Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524e79081b4f4e90c392715d45ea2322aebae0459c8c463289ce472e98e98b71' 
  AND token = 'LKOP9DOBzN1Mg6tvwRFVrcF+KVsnW4CbFIqaUyjGkAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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