SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f317842b65bd04a8b5d8d5324f4f209ca9188f21d4388da60c9ef74e598d586c' 
  AND token = '9wB+5mt0VYzdEH7UugKOncPWLFVjoVF01IQvPqLb0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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