SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93a1a5eda73e9f59f5e9198c80624acc4ff9868b29501d433756bc84e12ccc60' 
  AND token = 'RINKJmaOOhlOUjiI3RR+SIGBSpstLVn83x2w6LTgdFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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