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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95fba4fc8d836015305754eef62e6a7574ade12b5f2875d362c6eb16f17558c3' 
  AND token = 'QD0++id3lGqGz8f2g23SgrS9pHSyCTyOARqyX0YBCIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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