SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13dbe32390f8119c09147cc9ba8d67c27dc23e082274931bf026c5384e9b39b1' 
  AND token = 'sN9+Y80i36v0hBUXQJSf4gm5tZZEZEugDaQzoey2LhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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