Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb742e7c9a3a1a441a10efc8b4cf66d8e1c40fabbf1910e69bb9a10e6f3391e' 
  AND token = 'Ea44kf+lA0LXCJAKe536uPTI/iruDO3cgE4x1V9idIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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