Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a63ac6bba601eb236ac7def11727ae1a85670a3af7d653db1f269fbb11c243' 
  AND token = 'ftPcIN0bwHXpdjklPjFGxytXOkoDFvexIbgM1C9xZNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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