Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77301b06b531c46680743a8b61597db1af2729a5a325dc1e334d7f4d50970873' 
  AND token = '9Fl5BISji0rlBXfGsfbuj0iNtOgx/oMzGjGXEf2RFEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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