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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7360834a9074918955402a8c8323d32d09819ac8e1e2ce5352cd05b616780141' 
  AND token = 'WMRsc4VwuhOYbQC76rxmhcGvxK8fEq1+tD4Mk2/9WP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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