Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b087b762b3aab09d5a537fda12f771b77cfb78a14db7596ed3b860f31e045c0' 
  AND token = 'xj27cCpRR6GJgMpAXd+ggLkjlL/DeM9UA4/clvbChlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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