Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eccd2370c2808bb6907c8f264ed2ebdef4d4bb058e3d86c8d0a4bd88d0fe96' 
  AND token = 'TmKKSL5CSiIxWO8OOzlAwQM4VAkHi8GRmqGd/xDxjYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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