Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26068048551a13959b6fde6f0d79a6980a11d5cbdedf77d61631e0e17eb6c3ed' 
  AND token = 'oUwcOsUC3fxJ0YXd2NilNUV0wSjJ/Uybx0UJtpqNtrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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