Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6f0ebd867f9f04c705a985bfc27f3dd4ab18804493cd3b1f9ab22eedd5ba29' 
  AND token = 'pESwcOmNXUgZ0AknmgVSD4v7IolWhtKRmidpcDoS+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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