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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd56e3e88042ed47afe921b9a6d7389c83596dfc41e96c36fc12a8add829be487' 
  AND token = '2uoWdC/oI4KcvKBuE7aRGd4GcZipkzBcdVicYhu+fBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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