Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '229c7eecc08fa2cfcad17fbf8ee38f296e789a90d5b7615f5ee79442eddf0318' 
  AND token = 'gx95MrNYEoVwMtJMrJ7aWn/d1920k2khmGY3sW7hKts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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