Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5721c073d2352db30aafbf1ea2af1cddd61d3128e748803c097603b3b01bd44f' 
  AND token = 'htgQYIAi+E+4ooF0X/W5LXrQ65aUC1E7yJ100o7wau4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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