Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502b8e3e24343fd64c9cb51e6ce28a8f14c83925a0eee6fd47be2ab20f122355' 
  AND token = 'plexGQh+0hrMSX0/gnuuzuBXQIEsvLmIV9m+ha15WvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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