SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8e01f6c82c5610a23b7776d142c722a6852d5b7b7705d4ab4d12b79014f47882' 
  AND token = '0l4uivRPin8XkEW/5/vx9tYZgUeO4D/iaTzQuLIBhUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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