Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f85a8c6d38032f163895553959dcb80ea6b4841cc7d4a5df3ce8b57f79881ca' 
  AND token = 'ImeniiPJHPGRraJaiOpJ0waBTmJf+uLc3fN9fpR8twQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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