Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da19012dce6a987655857af6c9f037acc8acc5c73c524653864b46ee02aa3d15' 
  AND token = 'O5tbjcmzFclQ99w5dCsl0AxTeuHpW1MEooYdhtHTavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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