Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019c4845b45b6b3205f4f1418cd6b94003240b052d9e0f824d084dfc2fa0e4bc' 
  AND token = '/LwJ7/0wJ5qef9VD4YtRh5WhCtxsP0qieyZL9mCrSls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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