Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '48dd29420e77156a0c2489bc0a1a0bd14f2c43bc5b03a59a9b859e234716add1' 
  AND token = 'huo7NPnTvM463VhffGOfPHhiPbj98sQDU7RCU/VIUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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