SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '336eb3e9b8e4858edb0bbd9251c3c72b4dd65571262f85cb192cd45ec2a23b49' 
  AND token = 'Bml3QbrXWhEFJ1Ugqg/mpMCi+o44lY2xns7liCSZVbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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