Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd079639ee7354cb2a06bb21161082881349fbf289b5aae67270bbed5c28fde' 
  AND token = 'Zbw2IcBu8ziMoKDI9HJvPamtzSkyWhhdWrVKvCEC1dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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