Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd8c72f7287be8bf489b1bb2ca819161c1a7c969b2b38b624962a37ea651f26' 
  AND token = 'yIKIKbkr+TKMiqb5MksRFyw0IRN3DwWvs2q7oWGQTDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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