SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14046bfb2811257297875b3fe38d3a742a56e9048ee6138b4c98c519b0ab8d44' 
  AND token = 'O1iJGUw9ThYgEQ3DqhUcXH8ySSQ0l72E+vH7Nr1MRZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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