Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6af6d9bba9cbda2891f5df84a655d701341a7519becb8128deb97964ef030ea' 
  AND token = 'kwwrDwgraJf+SD/V6+6Dqh0qxKaQ30Wlx6Lj40krzpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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