Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8dda4ce19bac4b6fcfd8f309c9b90917f97aeecafb06e9e53f233027857af8' 
  AND token = 'uQekSqQ/yS4cIeGpZ1vTpuNNQjeBUD7C/ZlrJvYKTVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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