SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f132ac4f688e13891902449e7b7345c4b64a79428f1885c0735cf5c71d06e6c' 
  AND token = 'O6Fnoxy6qQoW7NYWp07FvbqVrCRuS+Zdh1PCuPhfYBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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