Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030975d7fb12b4d3cbee786a6de67cfe0f1560adb2450339f400c94a7f45daad' 
  AND token = 'rdizJeBql7Mj/A9Kavhso0jLY3bP4nzxtcarasthmqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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