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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5c8d29996135cebf7046c7fe468bc76369f539226a9446e9d56c35dc7e3ca50e' 
  AND token = '/EZqlFfLxwl+yDdYLHle+xPRBUI5oIkArIiDBxz6ysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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