Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3a4f803df643776aa405c8423f0da9d8589f6bb069143ccbe9d8deaf6eec086' 
  AND token = 'PYZLvPXJ6N2mtXeNx/oamWhAwWve5bIrNxa6670P3BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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