Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '76047ebcf1ae07154998aef1769c32b93d0b44b21d8ab25a8e0eb5f18a154753' 
  AND token = 'EHqexadixMM2n9eosflF1ktzyKwEc3H3C8IYQw3ieOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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