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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91d9ba925975bb3a07b3d01d359ee4869a10d5480eb286e18d3d0ab3b2613e97' 
  AND token = 'EehFkD3AvYHgW+8W/sWxkSwfM+JZbbrRxWL/CRYjhH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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