Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8a49a1dcf89798e822c63182ffe7bf1744e9f5e719c479e48319fa4063a8ca' 
  AND token = 'hierBet0apc5PRLGqXv4igApA9OmY2VWMhAxYljpxDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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