Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44470545d0adb8dc9a671a084f87bac2ff7b5877b92524d872d241279c3bec1' 
  AND token = 'sHXqs5zjuuxO6UdPMOIGG57jQ1K3lFwx0k7dhnLdsPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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