Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab3914edd17a264e097138e970bce3aa7b8d521184354f50a8ebdee7a218d305' 
  AND token = '23kdCTjOOCAPxdfqy6eAABJFmgSnbzUhHu/ScZbX9IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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