SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdfa0aca312f9de22fd0b7b3f21ff592a0da7f130148307cb1445417e9ca67dc' 
  AND token = 'W8q38IJ7/uOg3xNv+E0W9yHQHRTN+xZsGv0hJ8vYfl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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