Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b89b7756e2b1e47baa72e678d16b2113a20628918f583614b12f9e06a0b7b2' 
  AND token = 'UiDab9U+qYyKiMZxs4ntZSTefiSGZdVxPo7h3Svz9xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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