Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '611fb804d1bb8d3896207d21fc2daa38f593d018e39d89970be4f15105c86617' 
  AND token = 'aade1jpnI+xFuj1QSsJv3fMvL2AzCSMLSrulB8QfAOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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