Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47676c430a69f005094db93f4a000121f07467b5e87e6d36933a8d671f5fd42' 
  AND token = 'jQrb70b0pCwDpyl1G90Wi+RluMP6jRBBHgWriVl8+DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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