Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41867a1d5f7e5e23a5efd57482d52d1df6c3a7ed016021d7ef150e20e71ae457' 
  AND token = 'Sh3B+1bTQg9i2BoiBy8yHlTIDtm5qmJSS/WHdGKjr9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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