Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844d97043673ffe0bd919b1fccfbb4dff3a55ebd0e26a8bd67541f39924fd96b' 
  AND token = 'U3BhFq0N2AB8XadV06L3ygcKE86XHrveAB7BaXHfOlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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