Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa2dc9a5440a937d51a0312c5e04275f9476ab2f254ed70af9a4630d406e3e3' 
  AND token = 'R2fvTe5sTAb/jxcfQVKoCi+ERJd2HZ/tg4obSZXcato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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