Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100b899769ed4d7f375a6117a8ba1b108fdf7cda67cf8f088d7cc6c75467655f' 
  AND token = 'f/qaIg9xUMUsIEPs6LGnHYunDnkmRwiSEc9t2leBY2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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