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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47a70d5501b8a64cfa3116ff503e8fd9a59d8ca6825ce70ef2fd02581f4fb049' 
  AND token = 'j0Az3RupedGaWlCx1y/iIY1kK2peuELr6pfFe+OVuQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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