Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a15e433331517e4f6aeaf52f13c6cfbce5449d8cfbeed808a886d9017f7fb67' 
  AND token = 'DoIh+dfJEduxVed4NSIe6GtVqxnrBI7wkLYWo61ItHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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