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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34c47bc136624b6dd50404f662e350f75b1a067c2bd0cf9a2dc2c21c66a5ab22' 
  AND token = 'knN5FHQgYRu/iPaLC+CA4LSauKdE1jBDlIYfXOpYCfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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