Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0c0cea0158fbc76bb4cc2fe1c3f56d73910e3a318ad2d9593be8497918afa0' 
  AND token = 'n4AIrFQ1XJpujO/ERZmGcif8mk+Gt914wlPXwEmU9pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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