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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a8267dbc5903c61838f0183692bd733ad114feb0ebf3c08c780a7d70c06b880' 
  AND token = 'S1EKysr+Vm24ZNzwWa80Oi/71Sf4MFC03xtOczrGcmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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