SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c1783bfa902e3772f4d4a3f93f52ac29495bafb34cd8ff67834a7e67817f249b' 
  AND token = 'EAHSNEFYV//96ct63gafwzpvuwaiBKZJ3DhBtccde+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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