Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaedae7ff45e1dc50ed8d5ebe77227927c02dbf5edc055da9de4a8a98e97f54' 
  AND token = 'MYjc/wwDn/vUHk4LYOHE3T//wf8aRQ8vT2vG3ZAa6KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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