Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86df4be6e16d10b06168e79f12333538293cbb341b1465b05abea4c637c57f17' 
  AND token = '3XT/08Kl8Eq55vnAbUcLLm3fVXG99gKerU32Esk7FJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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