Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dda0e52bf36ac14bafc1614c62f67ec2ee88df933c54db38ba1dd9e92a5b0ff' 
  AND token = '6tdeCFeHkVJUI9u7B9s1AAmenb7nZUAhsNLt3HkJm8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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