Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a730512df62b3aec07cae83ca2ea11f43a0213a61c115e19491ccc2b3a78b9' 
  AND token = '4NVTuzAN67UEhoCnuhvfIfRKXBSZIG2CsWrUob1W9QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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