Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b6fc8f1a12796f2f830f13919b81a47e90e50e1551b5735eafc6f6ed79459c' 
  AND token = 'munzCUameb9CODH5OWtChLPNgDvL4f3IfNfEYW2eetY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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