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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2f45e96ef62984ea41bad12eb84d9c4d47fdfa9560ee956761497ca0220d32b' 
  AND token = 'snLbbg2+UjCMr5pADDoIzAg4d/3JmASuxHx++SdV3Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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