SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '39c6fd2b6694fec5424ef86192407cbf9a46f304a54c7ead2619676e965111e0' 
  AND token = 'QUfpvWPrwJgzsu6NjCb8mTSdUaY6cAtZHPJJcqwGWsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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