Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe3baa5675c8d0a5b8d3bf3ee619c5abca7ddd6d1db61a04a9f18589ef8c458' 
  AND token = 'SbdxkRY5qFpBTLWZRxDKhRiWLE57eAwoJlzvAUategE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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