Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018e3783c441d2f9a386cc2372044e4b4e278d4f5b27c0087c7ece3273c55653' 
  AND token = 'yne37EHXwB/+WjqZ8EfLyzpsSER1b3MiOayOkCGS9RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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