Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a0eac1795da7315c6d6fdf450cb670a1e5414897e7ecaca0feda2bba2c5be3' 
  AND token = 'FCxoXKcoke8xgfkx04MPpjI5PLTi+DuHz6c/XUoi1lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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