Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0db0e21001cbb792dc6e71c7362fbe52f7b97be75ccab7b12528afba0554d7' 
  AND token = '8Fd3KTvuAm/j+WQ6lZ28WpQ1bXscj9Sqv4WJ8j2R81o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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