Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c65b9363ee3f355245544afc64664013c62804e8cfde8668f458b0e67c1f50b' 
  AND token = 'fM5tbzg9BuUYAgm+UNehp5WeeWIK0HfMMnoyptT/guQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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