Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbb1bc3977789b7268434a42536231d932a590cc8d114e4a4ba5ffd54afca21' 
  AND token = 'izQ/6lZuYDrKinpX9XJaNM5CMeasdP6HgUK5YWBB31k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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