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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0284b0d138cf77e7f204aaa28801cf5839d585589ab410600f711634108b2393' 
  AND token = 'Cd1tEEejEiTQZHmBAFwn4XOSn/30kFU7FxQxzex5c8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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