Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b687c3436b0d7ee72868e6b20afa026113a5f254815ba3b4ed1f69e40b3616a' 
  AND token = 'MsUC3nUxfHz2sPfYtLwbLwyoe5dP1gmGCFxda2D898U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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