SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '604417d0ca6e87d3be5a4d39b6e4f29d20dc62cf5837b7a8ba661b69f5fce832' 
  AND token = '7gj1jWtFZV42rZzmmDmMdfiKpXEjS0UJ354UtTpWZ/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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