Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6b617bfaf8fda5430ed315ed5770234c333a6b4ed17757f4b85e9b5f2fab9f' 
  AND token = 'qCwvVdiHBcfDrKFYHe+a6SBbeFytCSm3gIdpHjXDu9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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