Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef92358825d9624d22d8ab8fa062db17d4ffb7efcd688b54af924d5e9cb4031c' 
  AND token = 'bUK2y3UM3ewVrfxoumGs6TcCUFymZ3dwgqq7x49nNUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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