Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bffcfe94138588bf3516bf0dfd52ada4f2ca3e3cf33c56153b2bdf11cc3078c' 
  AND token = 'tqb0TKD1TgM+T23CLN77KzwbiUWdTWOOoRwckQ6NxHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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