Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdd5a7afad8fe99d3041b5bf5a77ab14a5f0414cac0044c36b6ea0cde2be05f' 
  AND token = 'ImyT78wmVk1xikmm0HA3XwV2hT4p0DoBeqHxT4kUapE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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