Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9490970b01a31ae8cb1380b8049991ef4fe30ea2fb7062159b371940c41bc40f' 
  AND token = 'PnWCWT/MBnL4tXAowATXkIAqJ2OFjOHXDmHajshdOM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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