Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b342cb5c247124a1b45d89bf6193c5e9ac791651a1bae06a9e5a3d68a04798a' 
  AND token = 'uUaiUYIswhzmNHhmhupCNV4aQtrslZpOoSBq+h3hSSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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