Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b94e8625af75712a7ca6ca9ccab2834c86137fbb33336cf1b9ff5a136855b5' 
  AND token = 'TwWshpp+1OUqko/7Sfh4+TsvYsVj6ht+6NO8cfCjVJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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