Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70d574d1b43f53487914896f234a25f7f43e7a4a11aae8b766463704b383641' 
  AND token = 'YEMtCEZqKY0wHu095ZtP9IWqulPdJKVLvUdEgIki2t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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