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CREATE TABLE whois_e (
   id_num int(11) DEFAULT '0' NOT NULL,
...
   
);

create index whosis_1 on whois_e(id_num);
...
create index whosis_1 on whois_e(url);
create index whosis_1 on whois_e(sent);

select * from whois_e
where email = '$email'
and url = '$url'
and sent = '1'

create index whosis_2 on whois_e(email, url, sent);

CREATE TABLE whois_e (
   id_num int(11) unsigned DEFAULT '0' NOT NULL auto_increment primary
+ key,
...
   
);

INSERT into whois_e VALUES(...), (...),(...), (...).....;