Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b00633c125f0ab7897bae383825540d94d70c0aa471d6871de705a741db5470' 
  AND token = 'GpJieCpBIyyNDtBOrLJ+LDD24wRQfffIGgxnQtY3s4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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