Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f33dc6617faf5e27654121da423ad31dfc135b672c2028841ab09e700c6b71' 
  AND token = 'YMppwpDPHlZzy0EL1fRf+dmekqartahGHcqDO4yMsis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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