Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00c6c6aa67f365d91f22bd918699b2158c0c0bc86bf127e9b96b8476a14e354' 
  AND token = 'cQu//YHA6szi1XgP6F3s/4YtB9h8bH32Zg41kCaWtYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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