SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '127302fe3496600324400e5bd313450359c675d08a7f8cc56d39b98089a25f5f' 
  AND token = 'j9+CZj5NwwcDqUc+uHGVd3HC1INAWOwvKwKWmJYQeJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}