SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '241322c08b3aece673104b97dee6c5798f77c4128e4a294003e353a8d7f848fd' 
  AND token = 'KHTGKCG9qHNHXgQlHBOfR96PbM8VKktFKHUz+Zt1N9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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