Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d50ae94b9a15812e4913dbe457de680c5e76018b7f13018018619aee597415' 
  AND token = 'tVuvtEA/iR98IzoV3PEcSu11LTDsBkUfBTtMdLVn+7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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