Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6a360050e8a1fd7117d229c56fcd3fd07942c6983cfa40c8d60ec1b3f1536f' 
  AND token = 'ln3ni5kgyVGFD4EeyYn1Ki32WH/DSME+OzT+DEOT/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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