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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '221c517a6d1e9a1a1356a2734dff91f841e04593f801fe795a8aa66f65cd2725' 
  AND token = 'FlwpdeRFx2gbUubsoixrd81Z1QsMxAp+oIQ5l4RWBjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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