Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de1c7f9c9cd18cf0aaa55a56cce0f06e710c83b07401b538b49dcd5ae11bc49' 
  AND token = 'PHUWCIPco6MfYgf69pfM7xiYhRTIc2flN2aOxK5F/Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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