Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6357f8a4b61cc3f9ac3eff38e1bd023e45f73191f351cc8f7b2350f05acf340' 
  AND token = '1nA8ZCfUUFK95ZMe4gJeREVB+TqYI/AEVaz15alUxJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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