Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0405c013b62b38f1a15a4058a4260c879d4fbee6b220529de4edaf2e734e47f9' 
  AND token = 'kM6WnJWD3LxXI9OSE5A2zQJ1uk/ZrehXXn68zLfw358=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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