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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52e3a74a9115004532026ceed1f9632c5170c64f4a4338dc1fe9841c34b6b770' 
  AND token = 'JxQYUarReIzbDm0ginmVV+47d3I9ZBQ5rotxo9+j7zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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