Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbfb1692e97707cd6d98e5eacef7fb8c3b98e9be34498e5b2f8ce1c9cb6d481' 
  AND token = 'tUvEoeq96Iqn+X1nKznnTOv0CbVLQAtLDceDdaj4ziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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