Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2e1cb2c99315dda9e3838e93cdf06b3bec60792131f7040c568ee94ae70b6d' 
  AND token = 'WWvIlZq0kRO3v2ekpjzGBW1vMjEKd4Z3ZJ6hBDgnfiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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