Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a9477fcf45e37aa8f71c0cdd52807aeefced9c79cd9fc158ce455ae4e314ba' 
  AND token = 'UTAhzj0l+JP0v6W+Dr5AQDcnnmgNuLjLqxQK7NYdXUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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