Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab8b1f1c14f8cbe63769e895b7f2b8c044d67f8a8b3636b53c5d30f7eaef1c3' 
  AND token = 'zdM2/08zLlLea3aT7TZz/AxU4WzrnD8WxKHyWHG04+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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