Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91adf76cd75be1949a6224834bdded770ddc44d69a95aadaefb774cdcb70ce61' 
  AND token = 'z7JbPTUl/21xOWG8mIDOfI6y++hlEHNikP3zvaMqR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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