Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e6b1a8bfa213c478a401e6947e32029b2685ff1840e05128decc11be1b2db2' 
  AND token = '82bkRVsr8sI56As29jAZP7KMvbjNADH2ELOu2aYvYhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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