Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9ca62894ab6a6d1faeeb85ee1e709b6bdedbf0733ca5448f4e7b822d027927' 
  AND token = 'KPypNjFHTrQLigyGdm9nIAN+VAYv+/nSgkSWeuo7M7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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