SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '15d35ca9788ceb0d6bed12900b36343db68218bc4cc8d1b5b0d63ff488f788e9' 
  AND token = 'majVpVmwj/iRhkMCtZCd1ioN8g9OY5VFkToLSK9YTJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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