Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3396e168f9bbbc859a06d3ab9ca37e1058ca0c09796b05a9f6268342b1ae30' 
  AND token = 'A4gZRg/u5xGCyA/6XsiZ3Qf+qfLFnJef1K+XYIr9C6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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