Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d728921e000c4fd5b8c9e6c9b1cac5484eb7de92ef06dc9af5265e984e18fa' 
  AND token = 'uNg6emnOQFA84ihF3xzsAYg8t8lH+WvZ+KlgAai3ARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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