Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3df30a8ddb7d656a82d742150125d1be7569c1e21ec000d07cd93d8d378ddea' 
  AND token = '57mgMMfblX66EZBgqvj0QNq7BDN1ZK2LQycs/i+euc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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