Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf874a90e298949ddd284303ef38df9502b4d6240aa8002589f5fe222fc64125' 
  AND token = 'WaMjlH5Un14rW1KCFJ63vX1HUMTzdmeO9CWGcR3I/+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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