Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31a8b35ed8cb611f026a23e3f2361da5c0cc2e0354792342f2ccbef9f694f4b' 
  AND token = '9LyCY/oWcS430JAmdjxWWvY+yVo1Kzx6EuqsTnSLJIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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