SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ef6463f96a357814c6477517089556b2b9be9a50fcda09d35609bdc2ee346eca' 
  AND token = 'oJwh28QJfqlx4viErYCnZsxv5S4hT23DuOrVvns7LZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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