Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4ead7f8e60c37f8ffef4c39f869386e627a9bdc1a07c0753c42d0360484542' 
  AND token = 'FPLvpyNOrH3a9hQHVZ7vAnTnkNICPlX3UGcRa+ReQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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