Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e146bf7cc494aee9aeb14c368f2980e2c27eda04b23154556f1cfcc5dae441c' 
  AND token = 'K7Wz6UUkqgaCvhGEGacn1EmTCrl05lGLj3zHjVbgWcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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