Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a08822d1f7ef043b06afc433fd7ea33dad79013fc9a17fdab10b9af506ac9a' 
  AND token = 'fDQCJoU4LYfHk0kZ72UdKlCKZfI4xVqRlMkv1o2tn3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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