Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3f8b09cf5e80e918d4f12dacd02807dc8e5aad742da8700777420dbb599ceb7d' 
  AND token = 'eVkjjdxXDlxXizW0NoDtz45gRu300ybCla4qPg04Py0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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