Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f5aff6d38d37c121c44cc6e8b019b385be69d46d64c53eed2cefe2ab6a4114' 
  AND token = 'fKWAQxElQaQpYPykGC+/EanLk5899tGcU7Hh9LP8Vks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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