Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccbf7005a46c9734798c88a2f1ec4692557816b8a03b7dde689feee7499e303' 
  AND token = 'K/PIxSZmz9HRfMirtqel9q0vDadYy9fOnwTK95Nqb98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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