Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9afc4bcba93a1012d0ca5814d38f482ce093194a559f6ca14efc4802dce3cdb' 
  AND token = 'GxllTTBS3l1V54gkKNCnmvtoUnzHGC/16XLrNAIPIwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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