SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2442ad2b7507b5ad31158b1a16b206c3153d3118d71f9f7e83b7fe98e266f0cd' 
  AND token = 'W69TfZOhNxmlWp0+71I5af2BCU/DA/7OqpfzsFEOtGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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