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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3c2c9ec382068e50d340374983757039fe3f4df3d34fe326d5bb34af9e69aaea' 
  AND token = 'QKFLDtk322jEU69R50K4rDoaFAnfUm9fZyUdYhm/zF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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