Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912bd3f10feebab42aca08e2ae2d5e5eb42a94273660a39d7d982a8e5b6b2730' 
  AND token = 'iuZhpBHeex+BZoMQs1tnWgc9twHO+cuXD4mUL6vjn7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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