Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cf9e8db8ba2f7e4f9c1e452dfdfb2b86aec509e441bef065fad60237cfb278' 
  AND token = 'QSsNdvJSNyAvX/TXdK5zRGMmaURtCYHprrbSR/LHQLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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