Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '15bb7b6edb88c6a7b295506200da235e6b1e76cc46598481381ac8f9602f5d8a' 
  AND token = 'rVx3KDIPlniXy4Tzv66Xl7+92A2MXua/T/jxSc6m4og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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