Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd91733ef5f3a47bb9f36b0a49877d1b2ff0f9bf723168e79fbffe6f79e2f69' 
  AND token = 'S9X9fQBn/SneskctpHK8HqZN+qp/JF6hqQedKnK5Hbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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