Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe95bfbc9f9370c5fd762fcd5e08d644567556f895d9b4f13ae3821c87755eb' 
  AND token = 'Xyo9x4gPTCOuMAAr4yuxozrkZ7w49zCCKt6Oschxhi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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