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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dc972d3bcb53d28b87c981ed21440ddc27e041397a2949a4c50c907c35a01ae5' 
  AND token = 'QgUbrcF7+ub6hN+KIoesoPLyuTKquvq1tZXiqLkEV+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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