Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d7fd3184634f2b76e59670515ca56f21238b52c95796406a77e52b0c1d3fe3' 
  AND token = 'Cnw/7CuG30M7AreSI3Kt5Z9PDC997ILx7Rcde0aqZT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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