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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3c58fef5ee854613cbad7c577e287935422672c41c1e8b17a6a4b1a25f9adaa9' 
  AND token = 'ZdfURNDglZ07JLfsbR68cNUiDcFD+wRgH16XZhL9fpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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