Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f54ddac78180cdbb69cdba7bc8375d63702221c93db0964801f25605719bcd1d' 
  AND token = 'jvEbeEOauSbYsKnMTp9B/XPnqqVcVA4YtLXFAeBFxfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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