Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b79092eaf57a65d89132962d77ffb906dff8be6274a6d6ee823f4fd03a1dd5e' 
  AND token = 'kX8fCw2CtKeZqq9xBUe8fv3wcdNeyt/VqUlaVti07+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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