Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c61919f768f7b760c2881c8e64605d6e1373ce2f0c1ac56780a69213ca4ad71' 
  AND token = 'V8njYMug+u3wlRbFeJeZ/ATJ7iu2NkQpQNWnGP2e1GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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