Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231501867f4c7828c329b2920ce916905165568a5a12010f6cac73657bfe517f' 
  AND token = 'uPy1whiazxzfVeCkTlMA67z681aNJdeRvjab2wp+hIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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