Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d356b893bd3ab7d4f0c6741b7d96787a084325ae2e7d954239e7a889423f6f' 
  AND token = 'Qd1V+ySeTblo4Zh1fGeeUtBj8WjA1ChmOqGbH8+CbqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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