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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '63d9b0497d1e975c3a2eb865c36ca4f631b56cb1362e409719a367e1b65a7f3d' 
  AND token = 'CATF3ogCZUYNNCnpVsNqPc1hqEcnARwV8TZd2tvfFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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