Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e585313cd023dc478faa7843ab24b49f6b85b00ed5669cb9b9eb42ec5303b6' 
  AND token = 'LZ8xhz2+/lMNucN9R5EfRdwpuB1u5Znk8NATmwaO69Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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