Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b4d82dd97dd10b9bce6fa039495669f87c3d829c1bb267c7179a39bdb5e7ed' 
  AND token = '8qpmuoDHehPbfsk7HDcF1q/hSCzcCJLLQWjNwtFieOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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