SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '72ad6056ea1655f99c0c0ab5bf3b66f228f242d48b36eb1d8f05300db25d8f99' 
  AND token = '1BDNDjetCWw2N4IVQAJ4/qIPuH9pUiBnRm9ZFRPVJSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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