Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5240dad1355290324a4f2a6748d44e27cd8213d810a7f5c68f224633c930be2f' 
  AND token = 'A931iEp6dMRh2L3fJcPquv2WKBLPjlF/IGqtkSJlu5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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