Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d12f0a388f4b329b1948ebe3f5b04ccd4ac0339baafcd09a99dab9c88f6ece7' 
  AND token = 'MzwNuiaVFNkrcY5aNHvwpwRUKwpq2It5wi1BAnaLYys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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