Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfcfd996b949cc8f25aaa79af1d4b5368dbfc2b5b6bd4aaceabb7cc5b15a155' 
  AND token = 'fu1eMzFA8IZynut8yswZt7xY47j7xbnERtahjZTwyuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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