Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96ecd28c1c31badfb22cf7aba5f3cbdd3f56d30b95a00aa021ac6b5f16c6c9a' 
  AND token = '3XNkjefbcB+Vjxj8f8kAADJAWNY7XdiQH8TfBu9dmzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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