Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa4218c292e1b6b182d938a9fb766f313044eb815381a99d915cb60691f59cca' 
  AND token = 'J1cp2psm193lpWL80WF/vsDmoj3sGSeJYaj9m+jBCZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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