Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de31b53cad37c786b5028b09d5cb348d5ff689f88ab09de1d4de737692ee58ad' 
  AND token = 'dfq/JS5CQyByepeKQvFtMERMgX7G3SMfn22zKU1BCP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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