Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5ad8c40ca32fb1f2d2ef5345225ba7c546b7f661667ae4c3809e618986c3c8' 
  AND token = 'JeSmCn9mFQOKcLTPOmXcAgiVDUuMlnKNAm63BGAkHMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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