Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198359963afe7c1d3ec2dad74d0fa1b49501ab34d5c18d14f54ba9780cc8559a' 
  AND token = 'g4Rh5TBAgbXnpU47M7Kv5rZ7MOZkYvr2d9I6pbwA1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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