Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7bc1f9a235958c0541611ad87063b366357b8b6dd224aeca9c8802d1cc248c97' 
  AND token = '39KUbb5u3D4Skn+ZrrNOGewOT2cTMjtdXQUKPcc5bTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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