Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6befb73c54021c68e9966dc6ef3ebeb07d12722ca6cb218711d7413ce400891c' 
  AND token = 'u3DZJCl1ftPVI7EDcAvJLjhjryFdau7PzeIkHEryyaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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