SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd8f823f693aeae2e3c5a9246fee90d47d16b748d21916ab1f61afc1b03527f7' 
  AND token = '2oaINLIewcLAKLPYBpXwMfs/F9XIlATtXJpXiZ0VDkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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