Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84abc0a0f55dfdddb14f83a5c4b1fa8679c97eec0d005a2cab4018ab1a3491c' 
  AND token = 'xKaJdbO4JZfvRVagmjA/gkq3HiP11xjjZnIR73bjyFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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