Flutter SQFlite if exists in table check function

Question

I am new in flutter and I would be grateful for your help! Right now I am stuck on adding Favorite feature. The problem is that I need the color to change if it already exists in table. I have a ready map for search function and a table made using sqflite. I dont use futurebuilder due to that I cant use async/await. here is my page with search function

import 'package:flutter/material.dart';
import 'package:testshared/database/sql_helper.dart';

class MyApp extends  StatefulWidget {

  @override
  MyAppState createState()  => MyAppState();
}

class MyAppState extends State<MyApp> {

  Map<String, String> myMap = {
    "key1": "value1",
    "key2": "value2",
    "key3": "value3",
    "key4": "value4",
    "key5": "value5",
    "key6": "value1",
    "key7": "value2",
    "key8": "value3",
    "key9": "value4",
    "key10": "value5",
    "key11": "value1",
    "key12": "value2",
    "key13": "value3",
    "key14": "value4",
    "key15": "value5",
  };

  List<MapEntry<String, String>> filteredEntries = [];
  bool isExist = false;


  @override
  void initState() {
    super.initState();
    filteredEntries = myMap.entries.toList();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      color: Colors.greenAccent[700],
      home: Scaffold(
        appBar: AppBar(
          titleSpacing: 3,
          backgroundColor: Colors.greenAccent[700],
          title: TextField(
            decoration: const InputDecoration(
              contentPadding: EdgeInsets.all(5),
              filled: true,
              fillColor: Colors.white,
              hintText: 'Enter your word',
              border: OutlineInputBorder(
                borderRadius: BorderRadius.all(
                  Radius.circular(10.0),
                ),
              ),
            ),
            onSubmitted: (query) {
              setState(() {
                filteredEntries = myMap.entries
                    .where((entry) =>
                entry.key.contains(query) ||
                    entry.value.contains(query))
                    .toList();
              });
            },
          ),
        ),
        body: Column(
          children: [
            Expanded(
              child: ListView.builder (
                itemCount: filteredEntries.length,
                itemBuilder: (BuildContext context, int index) {
                  MapEntry<String, String> entry = filteredEntries[index];
                  String key = entry.key;
                  String value = entry.value;
                    return ListTile(
                      title: RichText(
                        text: TextSpan(
                          children: [
                            TextSpan(
                              text: (key),
                              style: const TextStyle(
                                  fontWeight: FontWeight.bold,
                                  fontSize: 25,
                                  color: Colors.red),
                            ),
                          ],
                        ),
                      ),
                      subtitle: RichText(
                        text: TextSpan(
                          children: [
                            TextSpan(
                              text: (value),
                              style: const TextStyle(
                                fontSize: 20,
                                color: Colors.black,
                              ),
                            ),
                          ],
                        ),
                      ),
                      trailing: IconButton(
                      onPressed: () {
                        DatabaseHelper.instance.add(
                          ReadyDict(word: entry.key, description: entry.value),
                        );
                      },
                      icon: const Icon(Icons.favorite_border),
                      color: Colors.red,
                    ),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

and my sqflite database page

import 'package:sqflite/sqflite.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart';
import 'dart:io';

class ReadyDict {
  final int? id;
  final String word;
  final String description;

  ReadyDict({this.id, required this.word, required this.description});

  factory ReadyDict.fromMap(Map<String, dynamic> json) => ReadyDict(
    id: json['id'],
    word: json['word'],
    description: json['description'],
  );

  Map<String, dynamic> toMap() {
    return{
      'word': word,
      'description': description,
    };
  }
}

class DatabaseHelper {
  DatabaseHelper._privateConstructor();
  static final DatabaseHelper instance = DatabaseHelper._privateConstructor();

  static Database? _database;
  Future<Database> get database async => _database ??= await _initDatabase();

  Future<Database> _initDatabase() async {
    Directory documentsDirectory = await getApplicationDocumentsDirectory();
    String path = join(documentsDirectory.path, 'words.db');
    return await openDatabase(
      path,
      version: 1,
      onCreate: _onCreate,
    );
  }

  Future _onCreate(Database db, int version) async {
    await db.execute("""
    CREATE TABLE words(
    id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    word TEXT,
    description TEXT
    createdAt TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP)""");
  }

  Future<List<ReadyDict>> getItems() async {
    Database db = await instance.database;
    var words = await db.query('words', orderBy: 'id DESC');
    List<ReadyDict> wordsList = words.isNotEmpty
    ? words.map((c) => ReadyDict.fromMap(c)).toList()
    : [];
    return wordsList;
  }

  Future<int> add(ReadyDict readyDict) async {
    Database db = await instance.database;
    return await db.insert('words', readyDict.toMap());
  }

  Future<int> remove(String word) async {
    Database db = await instance.database;
    return await db.delete('words', where: 'word LIKE ?', whereArgs: ['%$word%']);
  }

  Future<List<Map<String, dynamic>>> getItem(String key) async {
    Database db = await instance.database;
    return db!.rawQuery('SELECT * FROM words WHERE word = "$key"');
  }

  static Future<List<Map<String, dynamic>>> checkFavourite(var key) async {
    final Database db = await instance.database;
    return db!.rawQuery('SELECT * FROM words WHERE word = "$key"');
  }
}

I am new in stackoverflow too, so if I had some mistakes in my question I am sorry, Thank you!

I have tried to use checkFavourite function, it was in answer for another question, but that doesnt work cause when I call that with await it ask to be in async. Do i need to create another table with unsaved words and make a search field using textfield + dart.io to use futurebuilder? Thank you!