SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '20fc337b6c19de4c86877425e6f86c3581998ce47849a253e3eb75af0432efd8' 
  AND token = 'DYzHXM27gCFrT4b+1a7UaK/IZihx6OPJSJOelJiL7+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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