Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb8b1cd5ff8c7db574b47b190a5a2de0dc6a50813006687f791b58b74f5c433' 
  AND token = '4y1Ea5MVfsgVoJ8L4vUZyR1Hg3w0BUeCdq1tbI7VimM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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