SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9235cfa0102b42e52ee69275276da9718ec8f63eaa9f14b4052aca7a7b03b3c8' 
  AND token = 'x2sPXGaBYabPwTqhX9YzeeNIpW8lFZZ8Aw8wtBVKAlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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