Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4770db6a0e48a40d9eb0aa062f9daa6ddbbc7dcedf7f94969ca5fee2a6042b6d' 
  AND token = 'MouYXD5UjBOSUpyjLXHZGsYJYpuNU7RZbp5rh04Hns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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