Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40d71bed2cfde1f34ad2e4d372b74f237ae0496a1c2f96c923c716f4442eb2c1' 
  AND token = 'ae2m7e/OaQyaivcnREYbpKWsCfgmocchx8YqlnlYktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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