Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68920aad61bac57a48ce43913897470b40e5ffc69692308b1d21542ec12821de' 
  AND token = '0EJm7QE+OhrsrXsJ46HW/Ngrep8AGsT5Oo7TkcQecHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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