Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42f5f6cbe880daa5e206cbae815791dc70f194e4f6faf31f4e48228ef207cc5' 
  AND token = '0bXd0so5rqk7V4WiCqCiibpkwnfrVJVhI+/b/wWIy7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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