Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5793ebe5ba3cfc53cf86224d120d7cc6a9619ecd369fe51a75589c01e6d46f5' 
  AND token = 'AT1uyThqLDoMtbsIqjhNLfsVST30uhqg8sNWgazDskg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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