Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9652c591b356587cbf8b4951aae7601335af5ccbce45d1de919f739cea93c0' 
  AND token = '4coy1k6/mydHL0kj8OjYG8+H3cUDBgqcgQhOtgDMcBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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