Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed3bff3b50106225f1c305682d9c23aa42b3fb8e6ea000d3c5160c2a984c37a' 
  AND token = 'qUi+WtTqjB9DlTVDWeZ7RydyuQHAa9iv2E/eXaakKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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