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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9192f7ea8df69b74248ec3ea1dd2bf8b328357386d8f3ed18385b25dd2352d9d' 
  AND token = 'i5bIlydqEykvwf3dHkAfNN+meiymQ4Zuyx3ADRCuxNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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