Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d70b707691cae30424f41390c4f63893f728c40d83b776e25730b08e594e1aa' 
  AND token = '4oYOOcIJK8eNBHTC65qrf/JtIV6XKwkeyjGV7XojJGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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