Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b93618ad408ba1e077ff5bb1f7ea6d01db035d9256bbae0062b8e2eca8187b' 
  AND token = 'YzYKFn3i/Wvs/cBBzOKQ3mh/oHKA6hFjoPZ53Iz2NFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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