Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec424e3ff880436926ec9a74c927bd9d41d7eed68722cd5a5e052a4bb51bdd40' 
  AND token = '0O4BbL9dkUuHj9DEQcZiprHrqb5xu59U6jmeG5DwG3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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