Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea5208907275638259b7e15d69c0fc321c79046a87162c49c372bddc30ad209' 
  AND token = 'TNJLQRcfOym38nDb759Z244kw2YObj1fLSZPTGh5Ido=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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