SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2674d153ab8536d1968fb9fc0f5ad2baf93b457ca4dee6802e5f2df8c08e1402' 
  AND token = 'Vnw4lUB915TtFdBozJC7JUFGxwUMH+NIhHKWN0H+mc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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