Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8975a52df2aef745a5fde9c24fe77c8f3a507df2c11fef56454a353d99a95b40' 
  AND token = 'l7OeOQpBbtu6M/Xzwe7zIY9AY6bVx7uNutMlR7WpwC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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