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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ed728375c5b699627d0b731957560557948a68722269a214e8daac8a84d7cd9e' 
  AND token = 'C+DNWq7BwugP3JC3d86PY/5H8iNWXd8MvhTMyVLEdqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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