Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f9f238f29b1834370fea30a4796e0b077e4d1f9cdd1c3f7b2de7744f26b4f8' 
  AND token = 'DwwtoPqPlpDiUMdnBxXIpD1O4mEAeIl8vvWC0KS6iVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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