Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4eb787a80c3ba5c69b2e83fcd32b27e0bff30e8b114f891781a9c7cf0d0e0f' 
  AND token = 'OQ4/E3fbrdMFLM2nr6YutEhSDXGPXr9sNUEBSK/jseg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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