Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3834293970ea5cb9a4c94d9187de6112d861b1c75d66d36531dc076329e6b04' 
  AND token = '8lxYz81yzltE8jl2FcBe1O10LqL/97e+7L7fzPSky2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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