Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7ce4293d491eb2dff720f93ca6bf547415b2e9d1a0b5ebea8c936b4a8c88e3' 
  AND token = 'Q5ub0QnrpXQxXHB4WnM/AwDXDeZw9ST6o/C1eWuPl/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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